Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Patent
1997-07-17
1999-01-26
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
327157, 327159, 331 1A, 331 17, 331DIG2, H03L 708
Patent
active
058642498
ABSTRACT:
In a PLL circuit, the phase of the frequency of an input signal is compared with that of an oscillation frequency generated from a voltage-controlled oscillator. Charge pump circuits are provided which outputs currents pulse-width modulated based on information about the error between the two phases, respectively. An output voltage of a capacitor provided at a stage subsequent to one of the charge pump circuits is converted into a current by a gm amplifier. Further, the converted current is added to an output current of the other charge pump circuit. The so-added output is used as a control input for the voltage-controlled oscillator. The oscillation frequency of the voltage-controlled oscillator is produced as an output signal frequency.
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patent: 5491439 (1996-02-01), Kelkar et al.
patent: 5619161 (1997-04-01), Novof et al.
patent: 5670913 (1997-09-01), Garcia Palancar
patent: 5696468 (1997-12-01), Nise
patent: 5740213 (1998-04-01), Dreyer
Callahan Timothy P.
Kananen Ronald P.
Luu An T.
Sony Corporation
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